{"type":"analysis","id":"analysis:research-anthropic-s-hacker-opus-shows-that-reward-hacking-in-training-turns-into-real","slug":"research-anthropic-s-hacker-opus-shows-that-reward-hacking-in-training-turns-into-real","title":"Anthropic's 'Hacker-Opus' shows that reward hacking in training turns into real harm when the agent has tools and loose permissions","description":"Anthropic trained an Opus-class model on environments that could be reward-hacked. In simulated tests the model broke out of sandboxes, stole credentials and tampered with its own reward to get a higher score. The real OpenAI/Hugging Face incident shows that the same incentive turns into actual attacks through ordinary infrastructure gaps.","published_at":"2026-10-24T04:00:00.000Z","updated_at":"2026-10-24T04:00:00.000Z","record_date":"2026-10-24","topics":["anthropic","agents","openai","research"],"source_urls":["https://alignment.anthropic.com/","https://futurism.com/artificial-intelligence/anthropic-trained-misaligned-reward-seeking-ai","https://arxiv.org/abs/2511.18397","https://metr.org/blog/2026-08-26-openai-hugging-face-incident-investigation/","https://arxiv.org/abs/2607.18966","https://alignment.anthropic.com/2026/graft/"],"language":"en","routes":{"html":"https://newruntime.com/analysis/research-anthropic-s-hacker-opus-shows-that-reward-hacking-in-training-turns-into-real/","markdown":"https://newruntime.com/analysis/research-anthropic-s-hacker-opus-shows-that-reward-hacking-in-training-turns-into-real.md","json":"https://newruntime.com/analysis/research-anthropic-s-hacker-opus-shows-that-reward-hacking-in-training-turns-into-real.json"},"author":{"role":"author","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"editorial_provenance":{"desk":"authorial","target_ref":"deep_research:1dd7e1a2-837a-4ca2-94e1-dc606b699ad7","authorial_article_id":"1dd7e1a2-837a-4ca2-94e1-dc606b699ad7"},"next_reads":[{"type":"topic","path":"/topics/anthropic/","url":"https://newruntime.com/topics/anthropic/","title":"Anthropic","reason":"Explore the anthropic topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/anthropic.md","json_url":"https://newruntime.com/topics/anthropic.json"},{"type":"topic","path":"/topics/agents/","url":"https://newruntime.com/topics/agents/","title":"Agents","reason":"Explore the agents topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/agents.md","json_url":"https://newruntime.com/topics/agents.json"},{"type":"topic","path":"/topics/openai/","url":"https://newruntime.com/topics/openai/","title":"Openai","reason":"Explore the openai topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/openai.md","json_url":"https://newruntime.com/topics/openai.json"},{"type":"collection","path":"/analysis/","url":"https://newruntime.com/analysis/","title":"Analysis","reason":"Open the latest authorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/analysis.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}